Shoe-holding jack.



F. B. KEALL.

SHOE HOLDING JACK.

APPLICATION FILED mmzo. 1913.

Patented Sept. 21, 1915.

2 SHEETSSHEET 1.

8. W w Z 3 RH M w MM% 1 F. B. KEALL.

SHOE HOLDING JACK.

APPLICATION FILED IAN.20. 191a.

Patented Sept. 21, 1915.

2 SHEETS-SHEET 2.

COLUMBIA FLANOGRAPH co., WASHINGTON, in. c.

FRANK BYCRO'FT KEALL, OF LEICESTER, ENGLAND, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATEBSON, NEW JEBSEYyA CORPORATION OF NEW JERSEY.

. SHOE- remaine JACK.

Patented Sept. 21, 1915.

Application filed January 20,1913. Serial No. 743,107.

To all whom it may concern Be it known that I, FRANK l3. KEALL, a subject of the King of England, residing at Leicester, in the county of Leicester, England, have invented certain Improvements in Shoe-Holding Jacks, of which the following description, in connection with the accompanying drawings, is a specification,

like reference characters on the drawin s indicating like parts in the several figures.

In certain types of machines for treating shoes, such for example as machines for trimming or b-uinishing the edges of shoe bottoms, the shoe is clamped in a jack during the operation of the machine thereon. The present invention relates to shoe holding jacks of this general character.

This invention aims to render the processes of jacking or unjacking a shoe more rapid in execution than has been possible with acks as heretofore constructed; and, more particularly, to devise a clamping mechanism that will hold diiierent sizes and styles of shoes with substantially the same degree of pressure notwithstanding variations in the dimensions of the shoes. One mechanism by which these objects are attained will now be described with the aid of the accompanying drawings which show a jack or work support similar to that described and illustrated in Letters Patent No.

1,078,684, granted November 18, 1913, which patent is assigned to the assignee of'the present invention. It must not be assumed, however, that the present invention is confined in its application to a machine of this character or that it is limited to the construction and arrangement specifically described.

In the drawings, Figure 1 is a side view partly in section of a portion of a shoe holding jack showing the mechanism constituting a preferred embodiment of this invention; Fig. 2 is a section on the line 2-2, Fig. 1; Fig. 3 is a perspective view showing in detail the internal construction of the clamping mechanism, certain of the parts being broken away or omitted for the sake of clearness; and Fig. & is a view showing in detail part of the mechanism shown in the other figures.

The jack shown. comprises a base 2 that is adapted to support the sole of a shoe and a bracket 4: which may be cast integral with the base and has a casing 6 bolted thereto.

This casing has a bore formed therethro-ugh for the reception of a hollow plunger 8 which carries a toe-clamping part 10 that is adapted to bear on the top of the forepart or toe of a shoe resting on thebase 2. toe-clamping member 10 is pivoted at 12 to the lower end of a. threaded sleeve 14: which is adapted toslide in the plunger 8,

The

the provision of the pivot for the toeclamping member 10 and the fact that it is arranged longitudinally of the shoe enabling the member 10 to adjust itself laterally to the curvature of the toe of the shoe.

The sleeve 14 is provided with a flange 16 at its upper end" that is adapted to abut against an internal flange 18 on the plunger 8., the latter flange being disposed beneath the flange onthe sleeve. Below the internal flange 18 and bearing against the upon the sleeve below thehead of the 001- lar 22 to lock the latter in its adjusted position. Preferably, the external diameter of the collar 22 is made to correspond with the internal diameter of the recess in the plunger 8 which receives the spring 20 so that the collar slides within the said recess.

In the bore ofthe upper part of the plunger 8 two segmental plates 24: are secured, as by screws, each plate being provided with ratchet teeth which project toward the center of the plunger and are adapted to be engaged by one or the other of a pair of pawls 25 and 26 carried by a depending slide member 28. A spring 30-is interposed between the pawls to force their ends outwardly toward the racks. By having two racks with their teeth arranged in a staggered relationship, as shown, and by using pawls of equal lengths, or by maintaining the racks-with similarly arranged teeth and providing fpawls of slightly different lengths, the equivalent of a rack having fine teeth is obtained and at the sametime the construction has greater strength and durability than would be the case if smallteeth were employed.

formed as a bell crank lever and fulcrumed on a pivot 38 mounted in arms that project upwardly from the casing 6. The link 32- and the arm 34 of the actuating lever together constitute a toggle through which by the actuation of the handle 36 the depending slide member 28 may be raised or lowered. One of the arms of the casing 6 carries a sto-p40 against whichthe toggle bears when in its straightened condition. At its lower end the depending slidecmember 28 is provided with a cylindrical extension 42 which slides Within the bore of the sleeve 14, the slide member 28 above the extension being shaped so as to provide a recess in which the pawls 25 and 26 mayswing. Between the bottom of the bore in the sleeve 14 and the lower end 01": the extension 42 a light spring 44 is positioned. Outwardly projecting shoulders 46 are formed inthe mem ber 28 and coiiperating shoulders 48 are also provided on each of the rackplates 24 so that as the slide member 28 is raised the plunger 8 will also be lifted through the engagenient of these two sets of shoulders.

To disengage the pawls 25 and 26 from the racks 24 during the upward movement of the pawls,,two stationary deflecting'plates 50 are provided, each consisting of a light spring piece hung upon-the pivot pin 88, and they. extend into the plunger 8 with their ends located between the racks 24 and the shanks of the pawls25 and 26, respectively, (see Fig.2).v

The operation of the mechanism asabove set forth will now be described assuming the parts to bepositioned as follows :-The actuating handle 36 is turned so that the toggle 34, 32 is broken and the depending slide'member 28 is raised with the pawls 25 and 26 disengaged from the racks 24 by being brought into contact with the stationary depending plates. 50 and moved inwardly,

toward each other. Theplunger 8 is also raised through the shoulders 46 of the slide member 28 engaging withthe cooperating shoulders 48 of the rack pieces 24, and the sleeve l4'carrying the toe-clamping member 10 also is raised through the engagement of the internal flange 18 on the plunger 8 with thefiange 16 on the sleeve 14. The shoe is now placed in position on the support or tread engaging face 2 of the jack with its toe under the clamp 10. The actuating han- 1 -dle 36 is then turned so asto straighten the toggle 34, 32, and causethe parts to assume the positions in which they are shown in the drawings. The 'first result of this movement of the handle is to cause the, slide 28 to move downwardly and throughthe pressure ,dle. 'stant stroke, the extent of the clamping of theextension on the light spring 44 to move the clamp 10 into engagement with the toe of the shoe. Thesleeve l4, the collar 22, the plunger8 and racks 24' are all moved downwardly together until'the clamp 10 is brought into contact with the toe of r the shoe, the extent of depression of these parts depending upon the heightof the toe. During this movement the pawls are held out of engagement with the racks by the de fleeting members 50, but upon further movement of the actuator 36 the slide 28 isv depressed sufliciently to carry the 'pawls below the ends ofthe members 50, whereupon one or the other of the pawls engages its cooperating rack thus effecting a driving con-' nection through the strong spring 20 between the actuator 36 and the clamp 10. During this latter movement the sleeve 14 remains substantially stationary in contact with the toe of the shoe,and the extension 42 descends through it, compressing the light spring 44. The finalmovement of the actuator appliesv the clamping pressure to the shoe, the amount of this pressure being determined by the adjustment of the spring 20 and the travel of the clamp after the driving connection with the actuator is effected. It will be evident that the racks and pawls constitute in reality a one-way clutch and. 95 that the deflecting members 50 serve to ren- 1 der this clutch inoperative during the greater part of the movement of the actuating handle but permit it to become operative at the same Since the handle has a fixed or conmovement imparted to the clamp. 10 will be constant except for the very slight diiierence by which the opposite teeth of the racks are .105

ofiset or staggered. c g 7 Having describedv my invention what I claim as new and. desire to secure by Letters Patent of the United States is 5+ 1. In a shoe holding jack thecombination '7 of a shoe clamp, an actuating member, and

connecting mechanism between, said clamp and said member for; causing said clamp during a portion of the movement of said member to move into engagement with the shoe and. thereafter during anotherportion of the movement of said member-to apply a predetermined pressure to the shoef'iregard' less of its size or thickness.

2. In a shoe holding jack the combination .120 of ashoe clamp, an actuating member, connecting mechanism between saidclamp and said member for causing said clamp during a portion of the movement of said member to move into engagementwith the shoe and thereafter during another portion of the movement of said member to applya predetermined pressure to the shoe regardless of its size or thickness, and meanswhereby the degree of pressuremay be varied, '130 point in each stroke'of the han- 100 3. In a shoe holding jack the combination of a shoe clamp, an actuating member having an operative movement of predetermined extent and having a lost motion connection with said clamp, means operating during a portion of the movement of said member to move said clamp into engagement with the shoe, and means between the actuating member and the clamp, acting from predetermined point in the operative movement of said actuating member, to drive said clamp.

In a shoe holding jack the combination of a shoe clamp, an actuator having an op erative movement of predetermined extent, connections between said clamp and actuator for moving the clamp into engagement with the shoe, said connections including a light spring through which the movement of the actuator is transmitted, a strong spring, and means for establishing a driving connection through said strong spring between said actuator and said clamp at a predetermined point in the operative movement of said actuator.

5. In a shoe holding jack the combination of a shoe clamp, an actuator having an operative movement of predetermined extent, means controlled by said actuator for moving said clamp into engagement with the shoe, mechanism including a clutch arranged to effect during said clamping movement a driving connection between said actuator and said clamp, and means for rendering said clutch inoperative during a predetermined portion o1 the operative movement of said actuator.

6. In a shoe holding jack the combination of a shoe clamp, an actuator having a predetermined stroke, connections between said actuator and said clamp arranged to cause the clamp to move into engagement with the shoe during the first part of the movement oi the actuator, said connections including a li 'ht spring through which the movement of said actuator is transmitted, a strong spring, means for establishing a driving connection through said strong spring between said actuator and said clamp at substantially the same point in each stroke of the actuator, and means for adjusting the tension of said strong spring.

7. In a shoe holding jack the combination of a shoe support, a shoe clamp mounted for movement toward and from said support, an actuator having a stroke 01": predetermined extent, connections between said clamp and said actuator including a light spring arranged, upon movement of the actuator, to move the clamp into engagement 'ith a shoe resting on said support, a clutch member connected with said clamp to be positioned by said movement of the clamp, an additional clutch member movable with said actuator and arranged to have a clutching engagement with the other clutch member after said positioning movement of the latter member has been effected, and means to prevent the operative engagement of said clutch members until the actuator arrives at a predetermined point in its stroke.

8. In a shoe holding jack the combination of a shoe support, a shoe clamp mounted for movement toward and from position to clamp a shoe against said support, an actuator having a stroke of predetermined extent, connections between said clamp and actuator including a light spring arranged, upon movement of: the actuator, to move the clamp into engagement with a shoe' resting on said support, a pair of racks having relatively staggered teeth and connected with said clamp to be positioned by said movement of the clamp, a pair of pawls connected with said actuator to be moved thereby and arranged to have driving engagement with said racks, means for holding the pawls out of engagement with said racks until said actuator arrives at a predetermined point in its stroke, and a strong spring interposed between said racks and said clamp through which the movement of the racks is transmitted to the clamp.

9. In a shoe holding jack, the combination of a clamp, an actuator, and mechanism vdriven by said actuator toward said clamp for causing said clamp first to move into engagement with the shoe and then to apply a predetermined pressure to the shoe regardless of its size or thickness. 7

In testimony whereof- I have signed my name to this specification in the presence of two subscribing witnesses.

FRANK BYCROFT KEALL.

WVitnesses FREDERICK lVILLIAM WORTH, KATHERINE PEX'roN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

